394039644 has 12 divisors (see below), whose sum is σ = 919425864. Its totient is φ = 131346544.

The previous prime is 394039631. The next prime is 394039649. The reversal of 394039644 is 446930493.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 394039596 and 394039605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394039649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16418307 + ... + 16418330.

It is an arithmetic number, because the mean of its divisors is an integer number (76618822).

Almost surely, 2^394039644 is an apocalyptic number.

It is an amenable number.

394039644 is an abundant number, since it is smaller than the sum of its proper divisors (525386220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

394039644 is a wasteful number, since it uses less digits than its factorization.

394039644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32836644 (or 32836642 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 42.

The square root of 394039644 is about 19850.4318340937. The cubic root of 394039644 is about 733.1282803181.

The spelling of 394039644 in words is "three hundred ninety-four million, thirty-nine thousand, six hundred forty-four".